%0 Journal Article
%A A. I. Vasil'ev
%T On Bernstein's theorem about a~sequence of best approximations in spaces $L^{\varphi}$.
%J Trudy Instituta matematiki i mehaniki
%D 1998
%P 227-246
%V 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TIMM_1998_5_a16/
%G ru
%F TIMM_1998_5_a16